"If the level of escapes continue, the rivers in near future will not have any wild salmon, but only bewilded farmed salmon!"
The volume of escapees in rivers would create thru interbreeding with wild ones, a hybrid with almost no chance of survival and in this way, extinguish the wild.
Now we can present the worst offending companies on escaped farmed fish in 2006!:
Number of escaped farmed fish(2006)is the number right after the company's name:

1 Sjølaks AS 261 718
2 Storfjord Torsk AS 176 535
3 Sjøtroll Havbruk AS 104 500
4 Mortenlaks AS 93 358
5 Seafarm Invest AS 92 952
6 Marine Harvest 70 500
7 R. Lernes AS 54 615
8 Lofoten Sjøprodukter AS 47 000
9 Vest Marin Produksjon 41 755
10 Sinkaberg-Hansen AS 39 144
11 Codfarmeres AS 32 000
12 Høllalaks AS 30 449
13 Kobbevik og Furuholmen 16 000
14 Skei Marinfisk AS 15 536
15 Slakteriet AS 14 202
16 Akva Farms 11 000
17 Fjord Seafood Norway AS 10 275
18 Marøy Salmon 7 918
19 Skaga AS / Profish AS 6 623
20 Ultra Seafoood Loppa AS / Fjord Marin Helgeland AS 5 552
21 Altafjord Oppdrett AS 5 000
22 Tysfjord Marine Farm AS 5 000
23 Aasjord Brd. AS 4 880
24 Marin Invest 3 000
25 Artic Kvæfjord AS / Salmon AS 2 809
26 Brandasund Fiskeforedling 2 259
27 Flatanger settefisk 2 000
28 Nordland Akva AS 2 000
29 Norsk Marin Fisk AS 2 000
30 Steinvik Fiskefarm 2 000
31 Fiskekultur AS 1 000
32 Grieg Cod Farming AS 1 000
33 Haukaa Settefisk, Pan Fish Norway AS 1 000
34 Woll Henrik Hoel, Verafisk 1 000
35 Lofilab AS 700
36 Nova Sea AS 700
37 Nygård Laks AS 500
38 UFO Laks, Fjord Seafood Norway 500
39 Veststar AS 300
40 Bremnes Seashore AS 200
41 Brillant Fiskeoppdrett AS 200
42 Hydrotech AS 145
43 Midsund Fisk AS 100
44 Pan Fish Norway AS, Processing 100
45 Rogaland Fjordbruk AS 100
46 Fjordlaks Aqua AS 46
47 Vestnorsk Havbrukslag/Erfjord Stamfisk 14
48 Osland Havbruk 2

TOTAL 1.170.187
Not all numbers represent salmon, but there are escaped cod and trout too